Something considered golden is shut up (7)
I believe the answer is:
silence
This clue is a double definition.
'something considered golden' is the first definition.
(as in the saying 'silence is golden')
'shut up' is the second definition.
(synonyms)
'is' is the link.
(Other definitions for silence that I've seen before include "Absence of sound" , "Absence of racket" , "Period of peace" , "that's golden" , "Quiescence" .)